Nagisa Hazuki (葉月 渚, Hazuki Nagisa) is a main character in the anime Free! - Iwatobi Swim Club. He is a first year student at Iwatobi High after transfering. Coincidently, he reunites with his old friends, the second year students Haruka Nanase, whose swimming he has admired since he was a child, and Makoto Tachibana.

When he was younger, he was in a swim club with Haruka, Makoto, and a boy name Rin Matsuoka. Together they won a relay, though not long after that, Rin moved away and Nagisa attended a diffrent school to Haruka and Makoto.

It was Nagisa who struck the idea to form a school swim club, in which he became the club's treasurer. When the trio is told by the school that they must recruit a new member and restore the old pool if they want to start a club, Nagisa gets right into action and seeks out Rei Ryugazaki, a fellow first year at the school.

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Nagisa has a strong and cheerful character, having many child-like qualities about him. He generally treats everyone kindly and is a very enthusiastic person, looking for exciting things to do. As well as being upbeat, he is also rather determined, as shown when he sets about getting Rei to be a member of the swim club. He also shows a lot of admiration towards Haruka and his swimming.

Unlike his other friends, Nagisa is rather shorter in height. Despite this, Nagisa has an impressive physique like the other boys, being well built, lean, and just as fit. He has a pale skin tone, wavy honey-blond hair, and magenta eyes. He also has a more childish appearance, partially due to his height and age compared to his friends.

He, Haruka, Makoto and Rin were in a swim club together and collectively won a relay. They buried the trophy they won at the Swim Club, with hopes of digging it back up when they are older. Nagisa studied at a different school to the rest of his friends, resulting in them losing touch.

Members of the fandom nicknamed him "Shota" before his official name was revealed, because of his youthful looks, short height (compared to the rest of his friends) and his resemblance to certain shota characters.

Some members of the fandom also speculated that he and Rin were related, as their eyes were similarly colored and shaped in the CM.